Affiliation:
1. Korea Institute of Machinery and Materials
2. Korea Institute of Machinery & Metals
3. Korea Institute of Machinery & Materials
Abstract
The microstructures and mechanical properties of 17-4 PH stainless steel at each steps of
heat treatment, such as homogenizing, solid solution treatment followed by aging treatment, longterm
aging at 400 °C, and recovery treatment, in order to obtain a better understanding of the
embrittlement phenomena on aging, was investigated. As the homogenizing treatment time
increased, the length of δ-ferrite decreased and elongated shape of δ-ferrite turned to sphere shape
with the decrease of volume fraction. The solution treated specimen mainly consists of lath
martensite with a small fraction of elongated δ-ferrite. The spherical particles existed a little in the
martensite matrix, while no precipitates were found in the δ-ferrite at the solution treated specimen.
As the aging treatment temperature increased, the strength decreased while the toughness increased.
The fcc Cu-rich particles precipitated in the δ-ferrite during the long-term aging at 400 °C after the
solution heat treatment. This precipitation causes the aged hardening after long-term aging
accompanied by decreases in elongation and charpy V-notch energy absorption. The strength and
elongation was restored after recovery treatment and the fcc-Cu precipitated were almost dissolved
into the δ-ferrite matrix.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics
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